Galaxy and Mass Assembly: The 1.4GHz SFR indicator, SFR-M* relation and predictions for ASKAP-GAMA

L.J.M. Davies, M.T. Huynh, A. Hopkins, N. Seymour, S.P. Driver, A.G.R. Robotham, Malcolm Bremer, I.K. Baldry, M.J.I. Brown, S. Brough, M. Cluver, M.W. Grootes, M. Jarvis, J. Loveday, M. Owers, Steven Phillipps, E. Sadler, L. Wang, A. Wright

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Abstract

We present a robust calibration of the 1.4 GHz radio continuum star formation rate (SFR) using a combination of the Galaxy And Mass Assembly (GAMA) survey and the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey. We identify individually detected 1.4 GHz GAMA-FIRST sources and derive stellar mass selected FIRST stacks using a late-type, non-AGN, volume limited sample - extending the robust parametrisation of the 1.4 GHz-SFR relation to faint luminosities. For both the individually detected galaxies and our stacked samples, we compare 1.4 GHz luminosity to SFRs from GAMA to derive a new 1.4 GHz luminosity-to-SFR relation with improved slope and normalisation. For the first time, we produce the radio SFR-M* relation over ~2 decades in stellar mass, and find that our new calibration is robust, and produces a SFR-M* relation which is consistent with all other GAMA SFR methods. Finally, using our new the 1.4 GHz luminosity-to-SFR calibration we make predictions for the number of star-forming GAMA sources which are likely to be detected in the upcoming ASKAP surveys - EMU and DINGO-continuum.
Original languageEnglish
Pages (from-to)2312-2324
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume466
Issue number2
Early online date30 Nov 2016
DOIs
Publication statusPublished - Apr 2017

Keywords

  • galaxies: star-formation
  • galaxies: evolution
  • radiation mechanisms: non-thermal
  • radio continuum: galaxies

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